21160313 has 2 divisors, whose sum is σ = 21160314. Its totient is φ = 21160312.

The previous prime is 21160309. The next prime is 21160331. The reversal of 21160313 is 31306112.

Together with next prime (21160331) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13337104 + 7823209 = 3652^2 + 2797^2 .

It is a cyclic number.

It is not a de Polignac number, because 21160313 - 2² = 21160309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21160291 and 21160300.

It is not a weakly prime, because it can be changed into another prime (21160333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10580156 + 10580157.

It is an arithmetic number, because the mean of its divisors is an integer number (10580157).

Almost surely, 2^21160313 is an apocalyptic number.

It is an amenable number.

21160313 is a deficient number, since it is larger than the sum of its proper divisors (1).

21160313 is an equidigital number, since it uses as much as digits as its factorization.

21160313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 21160313 is about 4600.0340216133. The cubic root of 21160313 is about 276.5926885641.

Adding to 21160313 its reverse (31306112), we get a palindrome (52466425).

The spelling of 21160313 in words is "twenty-one million, one hundred sixty thousand, three hundred thirteen".